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- /*
- #### # # # #
- # # # # # The FreeWare C library for
- # # ## ### # # # # ### RISC OS machines
- # # # # # # # # # # # ___________________________________
- # # #### ### ## # # # #
- # # # # # # # # # # Please refer to the accompanying
- #### ### #### # # ##### # ### documentation for conditions of use
- ________________________________________________________________________
-
- File: GFX.gfx.h
- Author: Copyright © 1992, 1993 Edouard Poor, Jason Williams, Jason Howat
- Version: 0.71 (02 Sep 1995)
- Purpose: Graphics manipulation commands
- Mods: 02 Sep 1995 JH Added Desk_GFX_Mode, Desk_GFX_SetOrigin.
- */
-
-
- #ifndef __Desk_GFX_h
- #define __Desk_GFX_h
-
- #ifdef __cplusplus
- extern "C" {
- #endif
-
-
- /* Plot codes to be used with the Desk_GFX_Plot function. */
-
- #define Desk_plot_SOLIDBOTH 0x00
- #define Desk_plot_SOLIDEXFINAL 0x08
- #define Desk_plot_DOTTEDBOTH 0x10
- #define Desk_plot_DOTTEDEXFINAL 0x18
- #define Desk_plot_SOLIDEXINIT 0x20
- #define Desk_plot_SOLIDEXBOTH 0x28
- #define Desk_plot_DOTTEDEXINIT 0x30
- #define Desk_plot_DOTTEDEXBOTH 0x38
- #define Desk_plot_POINT 0x40
- #define Desk_plot_HHORZLINEFILLNB 0x48
- #define Desk_plot_TRIANGLEFILL 0x50
- #define Desk_plot_HORIZLINEFILLB 0x58
- #define Desk_plot_RECTANGLEFILL 0x60
- #define Desk_plot_HORIZLINEFILLF 0x68
- #define Desk_plot_PARALLELFILL 0x70
- #define Desk_plot_HORIZLINEFILLNF 0x78
- #define Desk_plot_FLOODTOBACK 0x80
- #define Desk_plot_FLOODTOFORE 0x88
- #define Desk_plot_CIRCLE 0x90
- #define Desk_plot_CIRCLEFILL 0x98
- #define Desk_plot_CIRCLEARC 0xA0
- #define Desk_plot_SEGMENT 0xA8
- #define Desk_plot_SECTOR 0xB0
- #define Desk_plot_BLOCK 0xB8
- #define Desk_plot_ELLIPSE 0xC0
- #define Desk_plot_ELLIPSEFILL 0xC8
- #define Desk_plot_GRAPHICSCHAR 0xD0
- #define Desk_plot_SPRITE 0xE8
-
- /* Within each block of eight the offset from the base number means: */
- #define Desk_plot_MOVECURSORREL 0
- #define Desk_plot_DRAWRELFORE 1
- #define Desk_plot_DRAWRELINVERSE 2
- #define Desk_plot_DRAWRELBACK 3
- #define Desk_plot_MOVECURSORABS 4
- #define Desk_plot_DRAWABSFORE 5
- #define Desk_plot_DRAWABSINVERSE 6
- #define Desk_plot_DRAWABSBACK 7
-
-
- /* The above applies except for Desk_plot_BLOCK where the codes are as follows: */
- #define Desk_plot_BMOVEREL 0
- #define Desk_plot_BMOVERECTREL 1
- #define Desk_plot_BCOPYRECTREL 2
-
- #define Desk_plot_BMOVEABS 4
- #define Desk_plot_BMOVERECTABS 5
- #define Desk_plot_BCOPYRECTABS 6
-
-
- enum {
- Desk_gfx_action_OVERWRITE = 0,
- Desk_gfx_action_OR,
- Desk_gfx_action_AND,
- Desk_gfx_action_XOR,
- Desk_gfx_action_INVERT,
- Desk_gfx_action_LEAVE,
- Desk_gfx_action_ANDNOT,
- Desk_gfx_action_ORNOT,
-
- Desk_gfx_action_TRANSPARENTBACKGROUND = 8,
-
- Desk_gfx_action_COLOURPATTERN_1 = 16,
- Desk_gfx_action_COLOURPATTERN_2 = 32,
- Desk_gfx_action_COLOURPATTERN_3 = 48,
- Desk_gfx_action_COLOURPATTERN_4 = 64,
- Desk_gfx_action_COLOURPATTERN_GIANT = 80
- };
- /*
- Graphics plot actions. Use with Desk_GFX_GCOL and Desk_ColourTrans_SetGCOL.
- See PRM 1-566.
- */
-
- extern void Desk_GFX_Plot(int plotcode, int x, int y);
- /*
- * Executes one Desk_OS_Plot command.
- * plotcode is the Plot code (as above)
- * x and y are the X and Y screen coordinates to use
- */
-
-
-
- /* Desk_GFX_ miscellaneous drawing macros ------------------------------
- *
- * Below are some macros using Desk_GFX_Plot to make life easier for you.
- * the "By" form (MoveBy, etc) moves/draws relative to the current cursor
- * position, while the other form draws in absolute OS coords.
- *
- * Desk_GFX_Move(X, Y) Moves the graphics cursor to the OS co-ordinates X, Y
- * Desk_GFX_Plot(X, Y) Plots a pixel at the specified position
- * Desk_GFX_Draw(X, Y) Draws a line from the current cursor position to x, y
- */
-
- #define Desk_GFX_Move(x, y) Desk_GFX_Plot(Desk_plot_SOLIDBOTH + Desk_plot_MOVECURSORABS, x, y)
- #define Desk_GFX_MoveBy(x, y) Desk_GFX_Plot(Desk_plot_SOLIDBOTH + Desk_plot_MOVECURSORREL, x, y)
- #define Desk_GFX_PlotPoint(x, y) Desk_GFX_Plot(Desk_plot_POINT + Desk_plot_DRAWABSFORE, x, y)
- #define Desk_GFX_PlotPointBy(x, y) Desk_GFX_Plot(Desk_plot_POINT + Desk_plot_DRAWRELFORE, x, y)
- #define Desk_GFX_Draw(x, y) Desk_GFX_Plot(Desk_plot_SOLIDBOTH + Desk_plot_DRAWABSFORE, x, y)
- #define Desk_GFX_DrawBy(x, y) Desk_GFX_Plot(Desk_plot_SOLIDBOTH + Desk_plot_DRAWRELFORE, x, y)
-
-
- extern void Desk_GFX_Rectangle(int x, int y, int w, int h);
- /*
- Draws a rectangle outline
- */
-
- #define Desk_GFX_RectangleFill(x, y, w, h) \
- { \
- Desk_GFX_Move(x, y); \
- Desk_GFX_Plot(Desk_plot_RECTANGLEFILL + Desk_plot_DRAWRELFORE, w, h); \
- }
- /*
- Draws a filled rectangle
- */
-
- #define Desk_GFX_Circle(x, y, r) \
- { \
- Desk_GFX_Move(x, y); \
- Desk_GFX_Plot(Desk_plot_CIRCLE + Desk_plot_DRAWRELFORE, (r), 0); \
- }
- /*
- Draw circle outline
- */
-
- #define Desk_GFX_CircleFill(x, y, r) \
- { \
- Desk_GFX_Move(x, y); \
- Desk_GFX_Plot(Desk_plot_CIRCLEFILL + Desk_plot_DRAWRELFORE, (r), 0); \
- }
- /*
- Draw filled circle
- */
-
-
- extern void Desk_GFX_CLG(void);
- /*
- * Clears the current graphics window to the current background colour
- */
-
-
- extern void Desk_GFX_VDU(char ch);
- /* (An Desk_OS_WriteC veneer)
- * Writes the given ASCII character to the VDU stream
- * A macro is defined to allow use of the form VDU() as well as Desk_GFX_VDU()
- */
-
- #define VDU(C) Desk_GFX_VDU(C)
-
-
- #define Desk_GFX_GCOL(A, C) {Desk_GFX_VDU(18); Desk_GFX_VDU(A); Desk_GFX_VDU(C);}
- /* Sets graphics colour and action.
- * A macro which emits a VDU sequence to change graphics colours
- */
-
-
- #define Desk_GFX_Mode(M) {Desk_GFX_VDU(22); Desk_GFX_VDU(M);}
- /*
- * Sets screen mode.
- */
-
-
- #define Desk_GFX_SetOrigin(x, y) {short a=(x), b=(y); Desk_GFX_VDU(29); \
- Desk_GFX_VDU(a & 0xff); Desk_GFX_VDU((a>>8) & 0xff); \
- Desk_GFX_VDU(b & 0xff); Desk_GFX_VDU((b>>8) & 0xff);}
- /*
- * Sets the graphics origin.
- */
-
-
- extern void Desk_GFX_Write0( const char *string);
- /*
- * Writes the given zero-terminated string to the VDU stream
- * (veneer for SWI "Desk_OS_Write0")
- */
-
-
- extern void Desk_GFX_WriteN( const char *string, int numchars);
- /*
- * Writes 'numchars' characters from the given string to the VDU stream
- * (veneer for SWI "Desk_OS_WriteN")
- */
-
-
- extern void Desk_GFX_Wait(void);
- /*
- * [equivalent to WAIT, *FX 19, Desk_OS_Byte 19]
- *
- * This call does not return until the vertical refresh has finished.
- * This means that you get control back after the hardware has
- * finshed updating the screen so if you do any drawing immediately
- * after this call it will be done while the screen is not being
- * drawn. This helps reduce flicker. Calling this procedure in Wimp
- * applications should be only used sparingly as overuse will slow down
- * screen output to an unacceptable level. Generally only use by
- * experimentation--write your graphics code, if it flickers too much try
- * putting in a Desk_GFX_Wait() and see if it help. If it does and the update
- * speed isn't adversly affected then leave it in.
- */
-
- #ifdef __cplusplus
- }
- #endif
-
-
- #endif
-